A wireless device includes a phase control circuit and an antenna element. The phase control circuit configured to control each of phases frequencies of the plurality of transmission signals according to a transmission direction of which each the plurality of transmission signals is output, up-convert each frequencies of the plurality of transmission signals of which the phase is controlled. The antenna element configured to radiate a signal obtained by combining the upconverted plurality of transmission signals.

A millimeter wave mobile phone antenna structure including: a plurality of antenna elements, each antenna element having a port; a plurality of signal acquisition units, each having a mixer and an analog-to-digital converter to produce a digital sampled signal of a sub-carrier signal output by each port; and a baseband signal processor, used for multiplying the digital sampled signal of each sub-carrier signal with a real time channel frequency response related weighting function and sum up the products to obtain a total output value of the antenna structure. The difference between the antenna structure of the present invention and the current millimeter-wave antenna structure of mobile phones is that: the present invention uses antenna elements instead of antenna arrays; and the antenna structure of the present invention provides multi-port output signals, rather than a single output digital, to facilitate the adaptability of received signals combining on the baseband end.

A multi-band radio frequency front-end device, a multi-band receiver, and a multi-band transmitter, the multi-band radio frequency front-end device including a first radio frequency front-end circuit, where the first radio frequency front-end circuit works on a first band, a second radio frequency front-end circuit, where the second radio frequency front-end circuit works on a second band, a first input/output matching network, and a second input/output matching network, where routing of the first input/output matching network and routing of the second input/output matching network on a layout are annular and nested.

The present disclosure relates to a circuit including an input terminal configured to receive a first signal at a first frequency; a demodulation chain connected to the input terminal and including a low-noise amplifier having an input coupled to the terminal; a controllable variable impedance connected between a first node and a node configured to receive a reference potential, the first node being connected to the input terminal and/or to the amplifier input; and a current source configured to deliver a current at the first frequency to the first node.

A semiconductor chip includes a first wireless communication circuit, a second wireless communication circuit, and an auxiliary path. The first wireless communication circuit includes a signal path, wherein the signal path includes a signal node. The second wireless communication circuit includes a mixer and a local oscillator (LO) buffer. The LO buffer is arranged to receive and buffer an LO signal, and is further arranged to provide the LO signal to the mixer. The auxiliary path is arranged to electrically connect the LO buffer to the signal node of the signal path, wherein the LO buffer is reused for a loop-back test function of the first wireless communication circuit through the auxiliary path.

A receiver includes a switch network, a mixer, and an IQ mismatch (IQMM) estimation circuit. The switch network is adapted to be coupled to an output of a transmitter. The switch network is configured to selectably swap complementary signals of a differential pair. The mixer is coupled to the switch network and is configured to down-convert an output signal of the switch network. The IQ IQMM estimation circuit is coupled to the mixer, and is configured to estimate an IQMM of the transmitter based on an output signal of the mixer.

A signal mixing circuit device includes a first mixer, a second mixer and a signal amplifying circuit serially connected to the first mixer; the first mixer includes an RF signal input terminal for receiving an RF signal, LO signal input terminals for sampling a first and second LO signals, a first mixed-signal output terminal for outputting a first mixed signal and a second mixed-signal output terminal for outputting a second mixed signal; the second mixer includes an input terminal connected to a capacitor, two mixed-signal output terminals respectively connected to the first and second mixed-signal output terminals of the first mixer, LO signal input terminals for inversely sampling the first and second LO signals. With the double-balance nature of the second mixer core, the noise at the LO signal input terminals of the first mixer can be cancelled. A receiver includes the signal mixing circuit device is also disclosed.

The disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as long term evolution (LTE). An operation method of a device for upconversion in a wireless communication system is provided. The method includes receiving a first local oscillator (LO) signal, generating a second LO signal, based on the first LO signal and cross-coupled latches, receiving an input signal, generating an upconverted frequency, based on the second LO signal and the input signal, generating an output signal obtained by processing a harmonic component included in the upconverted frequency, and transmitting the generated output signal.

The present disclosure discloses a method for adjusting one or more LO frequencies in a receiver. The receiver performs down conversion on a received signal through one or more mixers by using the one or more LO frequencies, and outputs one or more symbols through an ADC. The method comprising the steps of: for each of the one or more LO frequencies, estimating a new LO frequency corresponding to a best signal quality of the received signal; and adjusting the LO frequency into the new LO frequency. The present disclosure also relates to a receiver for adjusting one or more LO frequencies.

A receiver includes an antenna block configured to transduce impinging electromagnetic signals into electrical signals; a signal conditioning block configured to condition electrical signals received from the antenna block; and a down-converter block configured to down-convert conditioned electrical signals received from the signal conditioning block. The down-converter block comprises a plurality of signal channels. The receiver further includes a plurality of analog-to-digital converters (ADCs) respectively connected to the signal channels of the down-converter block; and a field-programmable gate array (FPGA). The FPGA is configured to program the down-converter block by selecting a set of mixer frequencies and a set of bandwidths designed to remove interference signals in each signal channel. The selections are calculated to mitigate reductions in dynamic range in the ADCs due to interference. The FPGA is further configured to process digital signals received from the ADCs after the down-converter block has removed the interference signals.